ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2019 | |||||||||||||||||||||||||||||||||||||||||||||||||
Accrual for Environmental Loss Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of environmental liabilities, current and non-current |
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Schedule of changes to environmental remediation liabilities |
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